 On cow farts and pig emissions, it works out to about $250 per animal. They charge it not in dollars, of course, but in kroner, because that's what Denmark's currency is. As of 2030, farmers will be taxed 300 kroner per ton of carbon dioxide equivalent. The tax will increase to 750 kroner, about 108 bucks, by 2035. But because of an income tax deduction of 60%,